Where does “ផ្គត់ផ្គង់” come from?

ផ្គត់ផ្គង់ (Khmer) comes from Khmer ផ្គង់, from Khmer p-.

ផ្គត់ផ្គង់ (Khmer): to supply, to provide (with), to assist, to support (one's family), to make ends meet